Abstract: The kinetic of oxidation of Cobalt Complex (II) derived from 8-hydroxy quinoline and salicylaldehyde by potassium permanganate has been studied in the presence of acidic medium. The reaction is first order with respect to KMnO4 as well as Metal complex concentration. The reaction rate has been determined at different temperature and different thermodynamic parameters have been calculated which shows that the reaction rate increases with increase in temperature. With increase in the concentration of acid the reaction rate increases. A suitable mechanism has been proposed.